Machine for manufacturing strap sandals



Aug. 29, 1-939. J. s. KAMBORIAN 2,170,354

MACHINE FOR MANUFACTURING STRAP SANDALS Filed April 4, 1938 2 Sheets-Sheet 1 Fig. l. //\/\/E/\/ ER.

W5; Kp

MACHINE FOR MANUFACTURING STRAP SANDALS Filed April 4, 1938 2 Sheets-Sheet 2 g o 7/ I86 17 u ma 108 I4 I76 '51 n2 '0 g I 5.176 3 Im "'38 2 55 on the shoe.

Patented Aug. 29, 1939 um'ri-zo STATES PATENT; OFFICE 2.170.864 I momma ron msnmorunmd sraar SANDALS Application apt-i1 4, 1938, Serial No. 199,878

v This invention relates to machines for manufacturing strap sandals and other shoes of the type in which the shoe is adapted to be retained in place upon the foot bystraps or the like which extend upwardly from edge portions of the sole. It has heretofore been common practice in the 'manufacture of strap sandals to assemble straps with an insole secured to a last, to stretch the straps over the last, and to secure them in overlasted position by means of fastenings such as tacks or staples driven through thestraps and into the insole. g

It is an object of the present invention to provide an improvedmachine for use in making strap sandals and which is especially adapted to facilitate the assemblingof the insole and straps.

To this-end, and as illustrated, the invention provides a machine comprising strap severing mechanism, mechanism for feeding a predetermined length of strip material past the severing mechanism by means of which a piece is severed from the leading end of the strip material to provide an individual sandal strap, together with mechanism operable to spray adhesive upon an 4 insole presented to the machine, for wiping the end of a strap over the portion of the insole to which adhesive has been applied and for driving a fastening through the end of the strap. This construction is advantageous in that it facili- 0 tates the assembly of the straps and the insole and-requires little handling of the shoe and strip material during the strap attaching operation.

These and other features of the invention are disclosed inthe following specification and in the 85 accompanying drawings, and are pointed out in the claims.

In the drawings: Fig. 1 is arview in side elevation of a machin embodying one form of my invention; 7

'40 Fig. 2 is a plan view partly in. cross section of the machine shown in Fig. 1 showing a'shoe in operative positign relative to the strap instrumentalities;

Fig. 3 is an end view of a portion of the strap 45 feeding mechanism:

' Fig. 4 is a vie v in front elevation of a portion of the machine showing the strap securing instrumentalities: 1

Fig. 5 is a plan view illustrating the operation 50 of spraying the cement upon an insole;

Fig. 6 is a plan view illustrating the portion of the wiper at the end of thewiping operation; and Fig. 7 is a-view representing a portion of a shoe on a last showing the straps secured-1n position Fig. 1 of, the drawings illustrates the invention as applied to a machine for driving tacks and having a frame III carrying a tack nozzle 42 toward which strip material or strapping S is ad: vanced by a feed roll I past cutting off mecha- 5 nism comprising knives l6 and 18, a spray device 20 located adjacent to the nozzle for spraying cement upon a portion of an insole 22 on a last 24, and a wiper 26 for wiping a portion of the end of the strapping over the insole along the 10 surface to which the cement has been applied. The machine is provided with the usual tack driver 21, raceway 28, and tack separator 30, the various mechanisms being driven'from .a main shaft 32. The tack insertingmechanism may be 15 of any well-known type,that herein illustrated corresponding to that of the machine illustrated in United States Letters Patent No. 1,106,393,

granted August 11-, 1914', upon anappllcation filed in the name of L. MacKenzie. 20

The strapping S, which may be flat tubular braid or other strip material, is wound upon-a reel 34 carried by a bracket 36 on the frame and is advanced toward the nozzle I! through a flat tube 38, Figs. 2 and 4, by means of the feed roll '25 ll. Thefeed roll II is mounted upon a shaft Ill, Fig. 2, on a bracket 42 carried by the frame and has on its'outer end a disk which is cov- -ered with a friction material such as leather 6.

The disk "is forced outwardly by means of a spring "and is caused to engage a similar disk 50 which ls'splined to a vertical spindle", Figs. 1,

2 and 3, positioned in bearings 54 on the machine frame'and arranged to be-rotated by gears 58, 58, 60 and 62,-the last of which is mounted upon the main shaft 32. It is to be noted that the friction disk 50 is movable in a heightwise direction along the spindle I2 so that its position radially of thedlsk 44 can be varied withthejresult that the rotation of the disk 44 during one revolution '40 of the disk 55 will also bevaried so that the strip 8 will be advanced different distances beyond the knives l5 and I. depending upon the location of thedisk I0 outwardly of the,disk '44. When the edge of the disk I. is located atthece'nter of the 45 disk 44 therotation of the formerwill not result in any,feed movement of theroll ll. line length of feed of strapping for any one cycle of operations of the machine-can readily be adjusted by turning knob one. shaft it carried by a sleeve to and having on its rear emhteeth. 1a which. mesh with a vertically slidable rack 12. The rack carries at its upper end a fork 14 arranged to engagethe walls of a slot 16 on the mounting, of the disk 5| with the result that disk-5| can readily be adjusted radially of the disk 44 to vary it to the extent of feed movement oft he roll I4. A collar I8 on the shaft 88 bears a scale, preferably in inches, by which the amount of feed of the feed roll is indicated.

In order to guide the strip material from the reel 34 to the tube 38 I have provided a plate 88 rotatably mounted upon an arm 82 of a bell-crank lever pivoted to the frame at '84, the other arm 88 of which is engaged by a spring 88 normally operative to force the arm in a clockwise direction (Fig. 3) to press the edge of the plate 88 down upon an apron 98 at the outer end of the tube 38. The edge of the plate is notched as indicated at 92'to provide recesses of different widths adapted to receive different widths of material as required. The proper notch is located relatively to the apron by forcing the arm 82 in an upward direction against the spring and rotating the plate 88. This mechanism ,is such that the strip material from the reel will be guided to the tube 38 during its feed movement regardless of the width of the material.

The strip material advanced by the feed roll I4 passes over an idler roll 94 mounted upon a rotatable stud 98 so that'the axis of the roll is eccentric to the axis of the stud; The stud 98 carries a depending handle 98 which is urged in a clockwise direction by a spring I88. The construction is such that the spring.I88 normally causes the stud to rotate in a direction such.

that the idler roll 94 is yieldingly forced in a direction to press the strip material against the feed roll I4. -When a new reel of strip'material is introduced into the machine the handle 98 is moved in a counterclockwise direction to move theidler 94 away from the roll I4 so that the end of the strip material can be inserted between the rolls.

The strip material or strapping S is guided in the tube 38 at a point near the severing mechanism'which is located just beyond the forward end of thetube by means of two guide pins I82 carried by a bridging member I84 positioned above the topof the tube, the pins being arranged to enter openings in the tube and to extend therein. The pins I82 are so spaced apart that they will serve to.limit lateral movement of a strip passing through'the tube so that strips, particularly 'narrow strips, willfbe guided in a direction substantially normal to the knives I8 and I8 as the strip leaves the tube. Since one or another of the side walls of the tube will serve to guide comparatively wide strip material the guide pins are not needed and are mounted in such a way that they can be removed when wide material is being used. To this end the bridge I84 is'pivotally carried by a finger I86 which is mounted upon a stud I88 for pivotal movement ina vertical plane, the stud I88 in turn being mounted: upon a pin II8 for pivotal movement in a horizontal plane. The finger I88 has a handle II2 by which the pins can be moved out of the openings in the tube, the finger being-movable first heightwise and then laterally. A spring H4 is arranged to force the handle II2 upwardly to hold the-pins in 1 position when they are located in their openings.

The strip severing mechanism is located-immediately in advance of the forward end of the tube 88 and comprises a fixed knifel8, Fig. 1, and a movable knife I8 between which the strapping is advanced during the movement of the feed roll. The knife I8. is mounted for movement heightwise of a bracket H8 and is carriedat the lower end of a plunger I I8 normally forced in an upward direction by a spring I28 positioned between the bracket H8 and an abutment I2I at the upper end of the plunger H8. The knife I8. is operated by a treadle I22 through a treadle rod I24 connected to a slide I25 which, at its upper end, carries a finger-.I28 upon which is pivotally mounted a latch I28 having a hooked end I38 which is normally forced into engagement with the upper surface of the spring abutment I2I by a spring I32. The latch I28 is provided with 8. depending arm I34 having a cam surface I36 arranged upon downward movement of the latch to engage a pin I38, on an adjustable arm I39, thus to move the latch in a clockwise direction to release it from the spring abutment permitting the plunger I I8 to rise after the knives I8 and I8 have severed a piece of strapping.

When the treadle I22 is released a spring, not shown, raises it causing the latch to move upwardly relatively to the abutment and the spring I32 moves the latch to reengage the upper surface thereof.

The spray device 28 is of a type well known to the art and is provided with means for spraying adhesive such as rubber latex which is supplied to the sprayer through a tube I48 from a container I42 carried on the top of the machine, the latex being drawn bysuction through the spray nozzle by compressed air supplied through a tube I44, the spray operation being controlled by a valve I48 operated by a handle I48 pivoted upon the operating device at I58. The nozzle of the spray device is inclined at an angle to the horizontal, as shown in Figsl and 5, and is arranged to direct a jet of adhesive toward a limited marginal portion of an insole presented to the tack nozzle I2. The spray is operated in timed relation to the feeding and wiping operation; by means connected to the tack separator device 38.

This device is carried by an arm I52 (Figs. 1 and 4) carried by a bracket I54 mounted for angular -movement about the axis of a pivot rod I58 which carries, at its upper'end,-a fork I58- The rod I58 is actuated by a bell-crank lever having an arm I88 operatively connected to the fork I58, and an arm "I82 which engages a cam I84 on the main shaft 32.- The arrangement is such that the tack separator device is moved into position to engage tacks in the raceway to maintain them in position prior to a tack inserting" operation. The valve of the spray device 28 is conveniently operated at the same time by a link I88 connected to the bracket I54 and carrying a spring-pressed plunger I88 adapted to engage the free end of the link I48 to cause the latter to depress the valve I48. During this time the insole upon its last is held in position with the edge portion thereof adjusted to the nomle I2 with the fingers of the operator holding a strip of material to be attached to the insole with the end thereof slightly projecting above the edge of the insole and located laterally in alinement with the spray. nozzle. This results in latex being applied to the insole immediately in advance of the end of the strip. The-heightwise position of the shoe is controlled by an abutment I18 secured to a portion of the frame by a bolt I12 (Fig. 4) and which is arranged to engage the face of the main shaft 32.

arms

crank lever I63, I62, of the tack separator control mechanism. The wiper 26 is shown in its advanced'position in Fig. 6. The wiper has a slot I84 in the end thereof through which a tack may be driven temporarily to secure the end of the strapping in position on the insole while the adhesive is setting.

After the wiping operation just described has been completed the tack-inserting mechanism is operated to drive a tack through the end of the strapping and insole and into the last. It is to be noted that depression of the treadle I22 to effect an operation of the knives l6 and I8, causes movement of the slide 125 which carries a member I86 effective to operate mechanism to initiate operation of a one-revolution clutch to rotate the This mechanism is not shown herein but may be of any suitable type such as that illustrated in the aforementioned Letters Patent.

In the operation of the machine, the strip materialor strapping S is advanced by hand past the feed roll 14 through the tube 38, past the knives l6 and I8 bya suflicient distance to provide an adequate length of strap for the first piece to be attached to the insole. The operator then holds the end of the strapping along the side of the last with a small portion of the end thereof projecting above the insole adjacent to the point where it is to be attached and the shoe is presented to the abutment "0 with the end of the strappingin line with the wiper 26 and spray nozzle 20. The operator then adjusts the knob '64 to the length of the next strap which will be required and steps on the treadle. This initiates operation of the machine by means of a clutch (not shown) and the projecting piece of strapping is cut oil by the knives "and I! so that an individual strap is produced. The valve I48 of the spray nozzle is operated'to spray cement upon the insole adjacent to an end of the strap which is being held by the operator and the wiper 26 is caused to move-outwardly to wipe the end of the strap over the cemented area of the I insole after which the machine drives a tack through the end of the strap temporarily to secure it in positlon leaving the strap hanging.

This operation is repeated until the ends of several straps are attached to the insole on one side thereof. The feed mechanism is then set by means of the knob 64 so that no feeding will take place after a tacking operation. The free ends of the straps are then successively stretched over the last and are secured to the other side of the insole in the manner above described.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A machine for operating upon shoes comprising means forpressing an end of a piece of strip material against an insole presented to the machine, means for driving a fastening through the end ofthe strip material insecure the latter to the insole, strip severing means, and means machine, means for driving afastening through an end of the strip material to secure the latter to the insole, strip severingmeans, means operable to feed a strip of material a predetermined distance past the severing means, 'and means for varying the extent of feed of the material.

3-. A machine for operating upon shoes comprising means for pressing an end of a piece of strip material against an insole presented to the machine, means for driving a'fastening through an end of the strip to secure the latter to the insole, strip severing means, means .'operable between successive operations of the fastening inserting meansto feed a strip of material past the severing means, and manually operable means for-causing operation of the strip severing means prior to an operation of the pressing means.

spaced laterally of the spray device, means operable to feed a strip of material apredetermined distance past the strip severing means, and means for causing operation of the strip severing means prior to an operation of the spray device.

5. A machine for operating upon shoes comprising means for spraying adhesive upon a portion of an insole presented to the machine, a wiper oper-' able to press an end of a strip of material along a portion of the insole to which adhesive is applied, means for driving a fastening through the end oi. the strip temporarily to secure the strip to the .insole, strip severing means, and means for feed- .ing strip material past the severing-means subsequent to the fastening inserting operation.

6. A machine for operating upon shoes comprising fastening inserting mechanism, a reel for strip material, strip severing mechanism, intermittently operated means forfeeding strip material past the severing mechanism, means for spraying adhesive along a limited area of an insole presented to the fastening inserting mechanism, means for wiping an en'dof the strip along the portion of the insole to which adhesive has been applied, and means operable subsequent to the operation of the wiping means for causing the fastening inserting mechanism to drive a temporary fastening through the end of the strip to secure the strip to the insole.

'7. A machine for operating upon shoes comprising fastening inserting mechanism, strip severing mechanism spaced transversely of the fasteninginserting mechanism, a reel for strip material, means for feeding strip material from the reel past the strip severing mechanism and including a feed roll,-means for driving the feed roll comprising a shaft, a friction dislcmounted upon the'shaft, a rotary drive shaft, a second friction disk arranged to engage the first-mentioned diskand slidably mounted upon the drive shaft for movement radially 'of the first-mentioned disk, and manually operated means for varying the position of the second-mentioned disk relatively to the-lfirst-mentioned disk thereby" to vary the extent of feed movement imparted to the strip. g

8. A machine for operating upon shoes comprising fastening inserting-.means, means for feeding strip material toward the fastening inserting means, and means for severing a piece from the strip, said means comprising aspringpressed plunger, a knife carried by the plunger,

an arm mounted for movement heightwise of the machine, a latch carried by the arm and normally arranged to engage a portion of the plunger, 9. treadle for. initiating operation of the machine and operatively connected to the arm for operating the latch to cause an operation of-the knife, a cam on the latch, and a stud for engaging the cam arranged to release the latch subsequent to a severing operation. v

9. In a machine for operating upon shoes, a reel for strip material, strip severing means, means for advancing strip material toward the severing means in combination with a guide for the strip material comprising a pivotally mounted arm, and a plate carried by the arm and having in its periphery notches of different widths for guiding strip material of various widths, a fiat the reel toward the severing knife, 9. fiat memher along which the strip material passes during its feed movement, a guide forthe strip material comprising a member having a plurality of depending portions adapted to embrace the material to limit lateral movement thereof, means '1 or mounting the guide comprising a link to which the guide is pivotally secured, and means for mounting the link for angular movement into position in which the guide is inoperative.

JACOB S. KAMBORIAN. 

